PC Hardware Diagnostics UEFI driver for HP Pavilion 20-b021a All-in-One This package provides the HP PC Hardware Diagnostics UEFI for the supported models running a supported operating system.­ The HP PC Hardware Diagnostics UEFI provides UEFI based hardware diagnostics for the supported models which is used to validate if a system is functioning correctly.­ In addition,­ it provides support for updating and managing the system BIOS and other device firmware on the system.­ Compatible devices: H3W12AA,­ H3W12AAR